# a = "hello"
# b = "world"
# print(a + b)


# a = 10
# b = "world"
# print(a + b)


# a = 10
# b = 9.9027
# print(a + b)


# a = True
# b = 9
# c = False
# print(a + b)
# print(b + c)


#int a = 10  #python中对变量不能这样声明
# a:int = 10  #python中如果要定义变量声明类型的话，采用这种方式
# b:str = "10"
# print(type(a))
# print(type(b))


a = 10;print(a)
